compat/timespec_get.c

   1 /*****************************************************************************
   2  * timespec_get.c: C11 timespec_get() replacement
   3  *****************************************************************************
   4  * Copyright © 2015 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <time.h>
  26 #include <unistd.h> /* _POSIX_TIMERS */
  27 #ifndef _POSIX_TIMERS
  28 #define _POSIX_TIMERS (-1)
  29 #endif
  30 #if (_POSIX_TIMERS <= 0)
  31 # include <sys/time.h> /* gettimeofday() */
  32 #endif
  33
  34 int timespec_get(struct timespec *ts, int base)
  35 {
  36     switch (base)
  37     {
  38         case TIME_UTC:
  39 #if (_POSIX_TIMERS >= 0)
  40             if (clock_gettime(CLOCK_REALTIME, ts) == 0)
  41                 break;
  42 #endif
  43 #if (_POSIX_TIMERS <= 0)
  44         {
  45             struct timeval tv;
  46
  47             if (gettimeofday(&tv, NULL) == 0)
  48             {
  49                 ts->tv_sec = tv.tv_sec;
  50                 ts->tv_nsec = tv.tv_usec * 1000;
  51                 break;
  52             }
  53         }
  54 #endif
  55             /* fall through */
  56         default:
  57             return 0;
  58     }
  59     return base;
  60 }